Uttarkashi is the largest district in the state of Uttarakhand, India. It is home to the origin of the Ganga and Yamuna rivers and several popular destinations for adventure sports. The document outlines key tourist attractions in Uttarkashi such as Nachiketa Tal, Gangotri, Gaumukh, Yamunotri, and Dodital. It also discusses the types of adventure tourism available including mountain biking, rafting, and jungle tourism. Both the positive impacts of increased employment, revenue, and preservation efforts and the negative impacts of pollution, crime, overpopulation, and resource depletion from tourism are mentioned.